Combined chain and lock stitch.



H. H. FEFELL. COMBINED CHAIN AND LOCK STITCH.

APPLICATION FILED MAR. 9| |915.

Patented May 22, 1917'.

ENRY FE'EELL,

or DAYTON, oHro.'

coivrBrNnn crrn'rivaivn` LOCK sr'rrcir. f y

To all whom it may concern: Y i

Be it known that I, HENRY H. FEFELL, a citizen of the United States, residing at Dayton, inthe county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Combined Chain and Iioclr Stitches; and I do declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates-to improvements in stitching` and has for its object to provide a combined chain and lock stitch which may be formed by machines without the use of bobbins, the chain stitch beingk formed of one thread, while an additional thread is provided for locking the loops or links of the chain. V

With the foregoing general object in view, the invention resides in the method of forming the improved stitch as well as in the completed stitch, both methodV vand article being illustrated fully in the accompanying drawing which constitutes a part of this application and in which;

Figures 1 to 6 are diagrams showing Athe numerous steps in 'forming the improved i stitch by machine operations;

Fig. 7 is a top view of aportion of the completed stitching; Y v

Fig. 8 is a bottom viewthereof; and

Fig. 9 is a sectional view of the material showing the stitching in elevation, this section being taken approximately on the line 9-9 of Fig.V 7.- a V In the accompanying drawing, the numerals l and 2 represent ak pair of vertically moving needles which are spaced apart in the direction in which the material to be stitched travels, the lower end of the needle 1 being, disposed below that of the needle 2 for a reason to be set forth.

Cooperating with the needles l and 2 in V forming vthe improved stitch, is a vlooper 4 which will be disposed beneath thel work rest of the machine as indicatedin the drawings, said looper and the two needles being operated in synchronism by any preferred means which constitutes no part of the present invention. It is essential, however, that `the looper 4 be provided with an elongated head 5 which is moved in close proximity to the path of the needles, said head having therein a slot which opens throughv Specification of Letters Patent.

Patented May 22, 1917.

. Application inea Maron 9, 1916. serial No. 83,121.

one of its ends and which extends in the direction of travel of the head.

In forming the stitch with a, mechanism such as that described, the needles l and 2 will bev threaded with independent threads 9 and 10 which may obviously be of different colors if this should vbe desirable. The material 3 is now placed beneath the needles as shown in Fig. l and the machine vset in operation.y This moves both needles downwardly simultaneously and thus forms l a long loop 9a of the thread 9 and a short loop l0"1 of the thread l0, the first named loopv being longer than the other, due to the diiference in length'of the two needles. The looper 4 which has now moved to the position shown in Fig. 2 travels to the left with the y result that the short loop 10a will be received in the slot 6, said short loop being now car ried through the long loop 9'd1 as shown in Fig'. 4. While the looper 4 is moving in this manner, the needles '1 and 2 have again risen and the materialv 3 has been advanced apredetermined amount. By the time the needles again move downwardly, the looper 4 starts to the right as shown in Fig. 5.

'On the second downward travel of the needles, the previouslyy formed long loop 9a will be pulled tightly around 10a as shown in Fig. 6, and a second short loop 10a will be formed of the thread l0, thisloop being carried through the previously formed loop 10a by the needle 2 in position to be received in the slot 6 of the looper in order that it may be Vtaken through a second long loop 9a i which isformed of the thread`9simultanef eration taking place successively as long as the machine is in use.

The shoulder 7 Vserves to engage the end of the numerous loops of the thread 10 as the looper 4 travels toward the right, and thus said loops will be opened sufficiently to readily allow the needle 2 to pass therethrough. 'Y Y f When using the improved stitch, no shuttle orbobbin is necessary, and it will'be obvious that the invention therefore effects a great saving of time in that the operation Vof the machine 4 need not be suspended as is the case with most types of sewing machines while the supply ofthread on the bobbin is being replenished. It is to be understood, however, that the two threads 9 and l0 will be passed through the usual or any other preferred type of tension device in order that the downward movements of the needles may tighten the loops previously made, said threads being unwound from appropriate spools or reels.

The complete stitch formed by the method above described is shown in Figs. 7, 8 and 9, from which iigures it will be seen that the interengaging loops l()EL of the thread l0, `which loops form thecommon type of chain stitch, are eiiectively locked by the transverse loops 9L1 of the thread 9. Furthermore, it is to be observed that a very neat seam will be provided, since on the exposed side thereof, the portions of both threads 9 and l0 between the loops of these threads lie parallel to each other.

From the foregoing description, when taken in connection with the accompanying drawing, the method of forming the combined chain and lock stitch as well as the advantages of the complete stitch will be readily understood without requiring a more extended explanation, and it will be obvious that the specific mechanism shown in the drawing need not necessarily be used in the formation of the same.

Although in the drawing the stitches are shown projecting from the material 3, it will be obvious that by varying the tension on the threads 9 and 10, they may be more or less embedded in said material, these adjustments being made according to the character of the material being operated upon.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner bviously, the loops 9a will more effectively hold the loops l0a against movement if they be drawn comparatively tight, although they will exert a locking action even though the tension on the threads be weak.

l. The method of forming a combined chain and lock stitch consisting in simultaneously passing a long loop of thread and a short loop of another thread through the material to be stitched, in carrying the short loop through the long loop, in then simultaneously passing a second long loop of the iirst thread and a second short loop of the second thread through the material, in pass ing said second short loop through the iirst short loop simultaneously with the last named operation, and in then carrying` said second short loop through the second long loop.

2. In a combined chain and lock stitch, the combination of a piece of material, a thread having interengaging loops passing through said material, and a second thread having locking loops passing through the material 'and around the exposed portions ol the rst named loops, substantially midway the ends thereof.

ln testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HENRY H. FEFELL.

Witnesses J. A. GRLESBAUER, C. A. GIOVANNETTI.

of Patents,

Washington, D. C. 

